This report documents a campaign of violence by the Myanmar security forces against Rohingya since 9 October 2016. Soldiers and police have randomly fired on and killed civilians, raped women and girls, torched whole villages and arbitrarily arrested Rohingya men without any information about their whereabouts or charges. These actions have been a form of collective punishment targeting Rohingya in northern Rakhine state, and may amount to crimes against humanity.